CVE-2021-21986

—

CVSS 3.1

9.8 critical

EPSS

13%p96

Published

May 26, 2021 (May 26, 2021)

Modified

Jun 17, 2026

Description

The vSphere Client (HTML5) contains a vulnerability in a vSphere authentication mechanism for the Virtual SAN Health Check, Site Recovery, vSphere Lifecycle Manager, and VMware Cloud Director Availability plug-ins. A malicious actor with network access to port 443 on vCenter Server may perform actions allowed by the impacted plug-ins without authentication.

Vendors: vmware
Products: vcenter server, cloud foundation
Weakness: CWE-306
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (12.9%)

In the news4 stories

VMware fixes critical vCenter Server RCE vulnerability, urges immediate action (CVE-2021-21985)

Help Net SecurityDec 13, 14:47 UTC · Dec 13, 2023Vulnerability CVE-2021-21985 CVE-2021-21986

Week in review: VMware critical updates, prevalent enterprise cybersecurity risks, 3 years of GDPR

Help Net SecurityMay 30, 00:00 UTC · May 30, 2021Policy & legal CVE-2021-21985 CVE-2021-21986 CVE-2021-30713

Another critical bug impacts all VMware vCenter Server installs

Security AffairsMay 26, 10:08 UTC · May 26, 2021Vulnerability CVE-2021-21985 CVE-2021-21972 CVE-2021-21986

Critical RCE Vulnerability Found in VMware vCenter Server — Patch Now!

The Hacker NewsMay 26, 04:57 UTC · May 26, 2021Vulnerability CVE-2021-21985 CVE-2021-21986 CVE-2021-21972+1 CVEs